From that list above, the only file which you need is: easytls

Easy-TLS is an Easy-RSA extension utility to help manage:

• Easy-RSA based x509 security credentials
• OpenVPN specific TLS keys
• Verified Inline files for use with OpenVPN
• Concise OpenVPN TLS-Crypt-V2 Client Key Metadata definition
• X509 Certificate and matched Easy-TLS Inline-file Expiry management tools
• Substantial Inter-active Menus

Easy-TLS also supports No-CA mode, which does not require an Easy-RSA CA:

• Use Easy-TLS to build self-signed X509 Certificates and keys.

Download: easytls to your easyrsa3 working directory.

For full support, you will also need these scripts for use by your OpenVPN Server:

• easytls-cryptv2-verify.sh (1) - Can be used stand-alone
  Used by Openvpn-Server to enforce TLS-Crypt-V2 metadata access policy rules.
  

• easytls-client-connect.sh (2) - Requires script (1)(3)
  Used by Openvpn-Server to enforce TLS-Key-type and address-filter access policy rules.
  

• easytls-client-disconnect.sh (3) - Requires script (1)(2)
  This Disconnect script is required by the Connect script.

• Optional - easytls-conntrac.lib - Requires script (1)(2)(3)
  Connection tracking plug-in, required for optional connection tracking.

easytls is intended to work everywhere that openvpn and easyrsa work.

• Easy-RSA Version 3.0.6+
• OpenVPN Version 2.5.0+

Please use the issues section here on github.
For live support you can use IRC channel: libera.chat/#easytls
Wiki: https://github.com/TinCanTech/easy-tls/wiki
Howto: https://github.com/TinCanTech/easy-tls/blob/master/EasyTLS-Howto-ii.md

Easy-TLS is written in the style of and borrows heavily from Easy-RSA
See: https://github.com/OpenVPN/easy-rsa
Note:
This is intended to facilitate maximum compatibility with Easy-RSA while extending functionality
to include direct support for OpenVPN specific TLS keys and Inline credentials.

See: https://github.com/OpenVPN/openvpn/blob/master/doc/tls-crypt-v2.txt

I hope that you find Easy-TLS to be a useful tool.